If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What can you see in the middle of March and April that you can never see in any other month?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Prove that the below maths equation is true.

8 + 8 = 91

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Find the number of squares in the below-given picture.

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

What does this rebus means ?